[ECOS] arm-elf-gdb with remote stubs

["Michael Anburaj" <embeddedeng at hotmail dot com>]

Hi,

I see this weird behavior with arm-elf-gdb -w (insight) while issuing the 
?finish? command within a particular ?while? loop compiled in thumb mode.

Target hardware: ARM7TDMI-S with Redboot in the Flash
Development platform : Windows/Cgywin
Compilation flags: -g -O0
Code is built for Thumb mode & loaded at free RAM address.

The source for this test program includes a c file (Thumb mode) containing 
the code listed below & a .S (ARM mode) that has the entry point, which just 
initializes the sp & branch to entry_func.
I load the elf image using ?remote target /dev/com1? & then set breakpoints 
within entry_func at the following statements: function call to func1() & 
the while(1).
After the code breaks at the 1st breakpoint, I step-into the function 
?func1' & then into func4. Then I issue ?finish? commands, 1st finish takes 
me back to func1 at the while & the following 3 ?finish? commands execute 
the while & after the 3rd time the code breaks at the while(1) in 
entry_func. Which is because gdb issues a ?$c? <for continue ? from the 
remote-log> without setting a breakpoint (UNDEF instruction) at address 
following ?bl func1' at entry_function.

Why??

Where as the same code built for ARM mode works great.

Thanks,
-Mike.


///////////// Code /////////////////

volatile int ii;

void func4()
{
	ii = ii+2;
}

void func1()
{
	int k=0;

	while(k++<3){func4();}
}

void func2()
{
	ii += 3;
}

void func3()
{
	ii += 4;
}

void entry_func(void)
{
	func1();

	func2();

	func3();

	while(1);

}



--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss